/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1996, by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * crcposix -- compute posix.2 compatable 32 bit CRC
 *
 * Copyright 1986, 1992 by Mortice Kern Systems Inc.  All rights reserved.
 *
 *
 * The POSIX.2 (draft 10) CRC algorithm.
 * This is a 32 bit CRC with polynomial
 *	x**32 + x**26 + x**23 + x**22 + x**16 + x**12 + x**11 + x**10 +
 *	x**8 + x**7 + x**5 + x**4 + x**2 + x**1 + x**0
 */
#ifdef M_RCSID
#ifndef lint
static char rcsID[] = "$Header: /rd/src/libc/mks/rcs/m_crcpos.c 1.11 1992/11/19 11:51:55 tj Exp $";
#endif
#endif

#include <mks.h>

static ulong crctab[256] = {	/* layout is from the POSIX.2 Rationale */
        0x00000000L,
        0x04C11DB7L, 0x09823B6EL, 0x0D4326D9L, 0x130476DCL, 0x17C56B6BL,
        0x1A864DB2L, 0x1E475005L, 0x2608EDB8L, 0x22C9F00FL, 0x2F8AD6D6L,
        0x2B4BCB61L, 0x350C9B64L, 0x31CD86D3L, 0x3C8EA00AL, 0x384FBDBDL,
        0x4C11DB70L, 0x48D0C6C7L, 0x4593E01EL, 0x4152FDA9L, 0x5F15ADACL,
        0x5BD4B01BL, 0x569796C2L, 0x52568B75L, 0x6A1936C8L, 0x6ED82B7FL,
        0x639B0DA6L, 0x675A1011L, 0x791D4014L, 0x7DDC5DA3L, 0x709F7B7AL,
        0x745E66CDL, 0x9823B6E0L, 0x9CE2AB57L, 0x91A18D8EL, 0x95609039L,
        0x8B27C03CL, 0x8FE6DD8BL, 0x82A5FB52L, 0x8664E6E5L, 0xBE2B5B58L,
        0xBAEA46EFL, 0xB7A96036L, 0xB3687D81L, 0xAD2F2D84L, 0xA9EE3033L,
        0xA4AD16EAL, 0xA06C0B5DL, 0xD4326D90L, 0xD0F37027L, 0xDDB056FEL,
        0xD9714B49L, 0xC7361B4CL, 0xC3F706FBL, 0xCEB42022L, 0xCA753D95L,
        0xF23A8028L, 0xF6FB9D9FL, 0xFBB8BB46L, 0xFF79A6F1L, 0xE13EF6F4L,
        0xE5FFEB43L, 0xE8BCCD9AL, 0xEC7DD02DL, 0x34867077L, 0x30476DC0L,
        0x3D044B19L, 0x39C556AEL, 0x278206ABL, 0x23431B1CL, 0x2E003DC5L,
        0x2AC12072L, 0x128E9DCFL, 0x164F8078L, 0x1B0CA6A1L, 0x1FCDBB16L,
        0x018AEB13L, 0x054BF6A4L, 0x0808D07DL, 0x0CC9CDCAL, 0x7897AB07L,
        0x7C56B6B0L, 0x71159069L, 0x75D48DDEL, 0x6B93DDDBL, 0x6F52C06CL,
        0x6211E6B5L, 0x66D0FB02L, 0x5E9F46BFL, 0x5A5E5B08L, 0x571D7DD1L,
        0x53DC6066L, 0x4D9B3063L, 0x495A2DD4L, 0x44190B0DL, 0x40D816BAL,
        0xACA5C697L, 0xA864DB20L, 0xA527FDF9L, 0xA1E6E04EL, 0xBFA1B04BL,
        0xBB60ADFCL, 0xB6238B25L, 0xB2E29692L, 0x8AAD2B2FL, 0x8E6C3698L,
        0x832F1041L, 0x87EE0DF6L, 0x99A95DF3L, 0x9D684044L, 0x902B669DL,
        0x94EA7B2AL, 0xE0B41DE7L, 0xE4750050L, 0xE9362689L, 0xEDF73B3EL,
        0xF3B06B3BL, 0xF771768CL, 0xFA325055L, 0xFEF34DE2L, 0xC6BCF05FL,
        0xC27DEDE8L, 0xCF3ECB31L, 0xCBFFD686L, 0xD5B88683L, 0xD1799B34L,
        0xDC3ABDEDL, 0xD8FBA05AL, 0x690CE0EEL, 0x6DCDFD59L, 0x608EDB80L,
        0x644FC637L, 0x7A089632L, 0x7EC98B85L, 0x738AAD5CL, 0x774BB0EBL,
        0x4F040D56L, 0x4BC510E1L, 0x46863638L, 0x42472B8FL, 0x5C007B8AL,
        0x58C1663DL, 0x558240E4L, 0x51435D53L, 0x251D3B9EL, 0x21DC2629L,
        0x2C9F00F0L, 0x285E1D47L, 0x36194D42L, 0x32D850F5L, 0x3F9B762CL,
        0x3B5A6B9BL, 0x0315D626L, 0x07D4CB91L, 0x0A97ED48L, 0x0E56F0FFL,
        0x1011A0FAL, 0x14D0BD4DL, 0x19939B94L, 0x1D528623L, 0xF12F560EL,
        0xF5EE4BB9L, 0xF8AD6D60L, 0xFC6C70D7L, 0xE22B20D2L, 0xE6EA3D65L,
        0xEBA91BBCL, 0xEF68060BL, 0xD727BBB6L, 0xD3E6A601L, 0xDEA580D8L,
        0xDA649D6FL, 0xC423CD6AL, 0xC0E2D0DDL, 0xCDA1F604L, 0xC960EBB3L,
        0xBD3E8D7EL, 0xB9FF90C9L, 0xB4BCB610L, 0xB07DABA7L, 0xAE3AFBA2L,
        0xAAFBE615L, 0xA7B8C0CCL, 0xA379DD7BL, 0x9B3660C6L, 0x9FF77D71L,
        0x92B45BA8L, 0x9675461FL, 0x8832161AL, 0x8CF30BADL, 0x81B02D74L,
        0x857130C3L, 0x5D8A9099L, 0x594B8D2EL, 0x5408ABF7L, 0x50C9B640L,
        0x4E8EE645L, 0x4A4FFBF2L, 0x470CDD2BL, 0x43CDC09CL, 0x7B827D21L,
        0x7F436096L, 0x7200464FL, 0x76C15BF8L, 0x68860BFDL, 0x6C47164AL,
        0x61043093L, 0x65C52D24L, 0x119B4BE9L, 0x155A565EL, 0x18197087L,
        0x1CD86D30L, 0x029F3D35L, 0x065E2082L, 0x0B1D065BL, 0x0FDC1BECL,
        0x3793A651L, 0x3352BBE6L, 0x3E119D3FL, 0x3AD08088L, 0x2497D08DL,
        0x2056CD3AL, 0x2D15EBE3L, 0x29D4F654L, 0xC5A92679L, 0xC1683BCEL,
        0xCC2B1D17L, 0xC8EA00A0L, 0xD6AD50A5L, 0xD26C4D12L, 0xDF2F6BCBL,
        0xDBEE767CL, 0xE3A1CBC1L, 0xE760D676L, 0xEA23F0AFL, 0xEEE2ED18L,
        0xF0A5BD1DL, 0xF464A0AAL, 0xF9278673L, 0xFDE69BC4L, 0x89B8FD09L,
        0x8D79E0BEL, 0x803AC667L, 0x84FBDBD0L, 0x9ABC8BD5L, 0x9E7D9662L,
        0x933EB0BBL, 0x97FFAD0CL, 0xAFB010B1L, 0xAB710D06L, 0xA6322BDFL,
        0xA2F33668L, 0xBCB4666DL, 0xB8757BDAL, 0xB5365D03L, 0xB1F740B4L
};

/*f
 * crcposix -- compute posix.2 compatible 32 bit CRC
 */
LDEFN void
m_crcposix (crcp, bp, n)
register ulong *crcp;
const uchar *bp;
register size_t n;
{
	while (n-- > 0)
	    *crcp = (*crcp<<8) ^ crctab[(uchar)((*crcp>>24)^*bp++)];
}
